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A boozed-up interior designer was busted after crashing her brand-new Mercedes into another luxury car following a Billy Joel concert at Madison Square Garden early Sunday, Port Authority Police Department sources said.

Allison Cantor, 42, of Short Hills, N.J., was charged with DWI after she got into a fender-bender near the Holland Tunnel at 12:30 a.m. while behind the wheel of her 2015 Mercedes-Benz shortly after attending Joel’s Saturday evening concert, sources said.

A Port Authority cop stationed at the tunnel spotted Cantor’s car striking the rear of a 2002 Mercedes being driven by 54-year-old man while she was heading south on Varick Street on her way home, said PAPD spokesman Joe Pentangelo.

Cantor got out of her car to look at the damage and then returned to her vehicle, ignoring a request by the cop to pull over, police said.

She drove through the tunnel to New Jersey pursued by cops who finally stopped her after she got out in Jersey City, sources aid.

After detecting the smell of alcohol on her breath, Cantor was administered field-sobriety and Breathalyzers test by PAPD Police Officer Rhett Peppi and failed both, sources said.

A source said she recorded a 1.4 percent reading on the Breathalyzer — nearly twice the legal limit — and admitted having a few drinks of vodka after the concert.

Cantor, who records show lives in a $1.6 million home, was charged with DWI, reckless driving and leaving the scene of an accident.